Jim Hu wrote:
We discovered this when we had a split wiki with private and public parts. And then we ran a Nutch search engine against our own wiki and saw all these hits that weren't supposed to be there.
The watermark idea sounds like it might be interesting. You wouldn't have to map the IPs...so what if the public users see the fact that it's a public wiki? Or, maybe you could just set up your private users to use a different skin that displays the warning.
No need to use a different skin (though doable), simply use an external item, like an image. E.g if you display '/image/editNS0.png', private.domain.com/image/editNS0.png will be a horrible warning, while public.domain.com/image/editNS0.png a smily face saying, "you're welcome to edit".